How many times a week should I work out?

Little background info: Recently new to training, been working out on and off for about 9 months, in college so I get busy sometimes. In summer now so I have all the time that I need.
Weight; 127 lbs
Bicep curl; 20 lbs each arm
Chest press w/ free weights; 35 lbs each arm

Main question would be how many times do I need to work out a week? I read a lot that you only need to hit each muscle group once a week, but I never feel sore for more than 3 days ever. As of now I hit each muscle 2 times a week with the exception of legs, I only hit that once.

Day 1; back/bicep
day 2; shoulders/legs
day 3; chest/tricep
day 4; rest
day 5; back/bicep
day 6; chest/tricep/shoulder
day7; rest

Do not use that workout split you listed.....look up starting strength. Lift 3x a week and ONLY use the compound lifts. Once you have mastered those and put on some good size, then look into splitting them up more (if you want).

Do not use that workout split you listed.....look up starting strength. Lift 3x a week and ONLY use the compound lifts. Once you have mastered those and put on some good size, then look into splitting them up more (if you want).